Green Bay Packers' Aaron Rodgers shakes hands with Chicago Bears' Tim Jennings (26) after an NFL football game Monday, Nov. 4, 2013, in Green Bay, Wis. Rodgers was injured in the first half of the game and did not return. The Bears won 27-20.

GREEN BAY, Wis. — It looked harmless enough — quarterback Aaron Rodgers and backup Seneca Wallace playing a light game of toss on the sideline with the Packers on defense in the first quarter.

They were the last throws Rodgers would make Monday night in the 27-20 loss to the Chicago Bears.

“I knew he was a in a little bit of pain, but no, we didn’t know what was going on,” Wallace said.

Next thing Wallace knew, he was takings snaps behind center and Rodgers was headed into the locker room for tests. The nightmare scenario for every Packers fan had come to fruition.

Rodgers emerged in the third quarter wearing a Packers cap and green warmups after being diagnosed with an injured left (non-throwing) shoulder following a sack on the first series by Shea McLellin.

“We never want to see anybody get hurt, and he’s one of the great, great players in our game,” Bears coach Marc Trestman said. “Certainly nobody wants to see him get hurt.”

Oh yeah, the Bears won, with their own backup quarterback, no less.

Josh McCown, playing in place of the injured Jay Cutler, threw two touchdown passes in a victory that ended a six-game skid to its NFC North rivals and forced a three-way tie atop the division with the Lions, who were idle this week. All three teams are 5-3.

Coach Mike McCarthy hoped to have more information on the health of his star quarterback on Tuesday following more tests. Rodgers hasn’t missed a game due to injury since Dec. 19, 2010.